King of grapple : you are proficient in grappling 

way of water : by the movement of water you can locate any sea creature size medium and up  in a 120ft dome   thru a nature or investigation .

arcane connection :  after spectating the creature for so long you now have a small arcane connection with it allowing you to cast Black Tentacles  once a day but you take 1 lvl of exhaustion no spell slot is needed but this connection works both ways after the spell has been cast the dm rolls a d8 if it lands on 1 the kraken demands a spell slot back of 2 or higher